In this document we describe Tralics, a LaTeX to XML translator, and its application to the Raweb. There are two parts: the first part describes the translator, the second part the tools required for the Raweb. This document has different chapters; we shall describe first how TeX can read an XML file and convert it to Pdf; in effect, we shall describe the xmltex, fotex and mathml packages, written by D. Carlisle et S. Rahtz, with some minor bug corrections and additions. We show how style sheets can be used to convert the XML source into XSL/FO or \HTML, or even XML. Finally, we shall explain the Raweb DTD.